import re

# txt = '请找出小猫吧，找出小猫吧，出小猫吧'
# cat = re.findall('出(.*?)吧',txt)
# print(cat)   # ['小猫', '小猫', '小猫']
# print(cat[0])



txt = ''
cat = re.findall('{(.*?)}',txt)
print(cat)   # ['小猫', '小猫', '小猫']
print(cat[0])